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Senior Long-Term Debt And Other Debt (Summary Of Future Principal Payments Due At Maturity On Senior Long-Term Debt And Other Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 63,519  
2021 25,546  
2022 356,185  
2023 250,428  
2024 0  
2025 and thereafter 2,879,852  
Total principal payments 3,575,530  
Net unamortized premium (35,673)  
Net unamortized debt issuance costs (5,674)  
Senior long-term debt and other debt $ 3,534,183 $ 3,009,577